F. H. Richardson's bluebook of projection (1935)

Page scan 000104 from F. H. Richardson's bluebook of projection

Record Details:

Title:
F. H. Richardson's bluebook of projection
Date:
1935
Publisher:
New York : Quigley Publishing Company, Inc.
Volume:
F. H. Richardson's bluebook of projection
Leaf #:
000104
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
{"Media History Digital Library","Jeff Joseph"}
Coordinator:
Media History Digital Library
Description:
Date Added:
August 01, 2024
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86 richardson's bluebqok of projection Link Fuses (79) A link fuse is nothing more than a fuse wire at each end of which is attached a copper clip, as shown in Fig. 26. They must not be used except by order or consent of the authorities, and then only in metal or other approved cabinet provided with a self-closing Figure 25 door. Their use in theatres is not permissible anywhere except inside the projection room. Boosting Fuses (80) "Boosting" a fuse consists in increasing its capacity by creating a metallic by-pass, consisting usually of a small copper wire, or in the case of plug fuses, a copper coin so arranged that when the fuse is in place the coin forms contact with the two fuse terminals. B Figure 26. (81) A "boosted" fuse no longer serves its purpose of protecting the circuit wires and apparatus attached thereto. If the "boost" be sufficiently heavy, as is usually the case where such practice is resorted to, both wires and apparatus are left without any real protection. Under this condition not only are wires and apparatus in grave danger of injury but the circuit wires may be heated to such high temperature as to cause fire. Never fuse a lighting circuit above the normal rated capacity of its wires or above the combined capacity of the lamps taking current from it, though in the latter case a margin of ten percent is allowable.